${\left[{\mathrm{Ca}}_2{\mathrm{CoO}}_3\right]}_{0.62}\left[{\mathrm{CoO}}_2\right]$, a two dimensional misfit metallic compound, is famous for its rich phases accessed by temperature, i.e., high temperature spin-state transition, metal-insulator transition (MIT) at intermediate temperature ($\sim 100\mathrm{K}$), and low temperature spin density wave (SDW). It enters into a SDW phase below $T_{\text{MIT}}$ which becomes long range at 27 K. Information on the independent role of misfit layers (rocksalt/${\mathrm{Ca}}_2{\mathrm{CoO}}_3$ and triangular/${\mathrm{CoO}}_2$) in these phases is scarce. By combining a set of complementary macroscopic (DC magnetization and resistivity) and microscopic (neutron diffraction and x-ray absorption fine structure spectroscopy) measurements on pure (CCO) and Tb substituted in the rocksalt layer of CCO (CCO1), magnetic correlations in both subsystems of this misfit compound are unraveled. CCO is found to exhibit glassiness, as well as exchange bias (EB) effects, while CCO1 does not exhibit glassiness, albeit it shows weaker EB effect. By combining local structure investigations from extended x-ray absorption fine structure (EXAFS) spectroscopy and neutron diffraction results on CCO, we confirm that the SDW arises in the ${\mathrm{CoO}}_2$ layer. Our results show that the magnetocrystalline anisotropy associated with the rocksalt layer acts as a source of pinning, which is responsible for EB effect. Ferromagnetic clusters in the ${\mathrm{Ca}}_2{\mathrm{CoO}}_3$ layer affects the SDW in ${\mathrm{CoO}}_2$ and ultimately glassiness arises.

中文翻译：

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错配[Ca2CoO3] 0.62 [CoO2]钴的子系统中的磁相关

${\left[{钙}_2{\mathrm{首席运营官}}_3\right]}_{0.62}\left[{\mathrm{首席运营官}}_2\right]$是一种二维失配金属化合物，因其富集相随温度而闻名，即高温自旋态转变，中间温度下的金属-绝缘子转变（MIT）（$〜100\mathrm{ķ}$）和低温自旋密度波（SDW）。它进入下面的SDW阶段${Ť}_{\text{麻省理工学院}}$ 在27 K时射程变长。有关失配层的独立作用的信息（岩盐/${钙}_2{\mathrm{首席运营官}}_3$ 和三角形/${\mathrm{首席运营官}}_2$）在这些阶段是稀缺的。通过结合一组互补的宏观（直流磁化强度和电阻率）和微观（中子衍射和X射线吸收精细结构光谱）测量，对在CCO岩盐层（CCO1）中取代的纯（CCO）和Tb进行测量，两者的磁相关性该错配化合物的子系统将被分解。发现CCO表现出玻璃化以及交换偏差（EB）效果，而CCO1尽管表现出较弱的EB效果，但不显示玻璃化。通过结合扩展X射线吸收精细结构（EXAFS）光谱的局部结构研究和CCO的中子衍射结果，我们确认SDW出现在${\mathrm{首席运营官}}_2$层。我们的结果表明，与岩盐层相关的磁晶各向异性是钉扎的来源，这是造成EB效应的原因。中的铁磁团簇${钙}_2{\mathrm{首席运营官}}_3$ 层会影响SDW ${\mathrm{首席运营官}}_2$ 最终产生玻璃感。